abstract：<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>CSS浮动实现</title> <style type="text/css"> *{ margin:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS浮动实现</title>
<style type="text/css">
*{
margin: 0px;
padding: 0px;
}
.float_one{
width: 150px;
height: 30px;
line-height: 30px;
float: left;
margin:1px;
background: #ccc;
text-align: center;
position: relative;
}
.float_one{
}
.main{
margin:10px 50px;
}
.float_two{
background: pink;
display:none;
}
.float_two div{
border: 1px solid #ccc;
}
.float_one:hover .float_two{
display: block;
}
</style>
</head>
<body>
<div class='main'>
<div class="float_one">
PHP
<div class="float_two">
<div>SESSION</div>
<div>COOKICE</div>
</div>
</div>
<div class="float_one">JAVA
<div class="float_two">
<div>SPRING</div>
<div>STATUS</div>
</div>
</div>
<div class="float_one">MYSQL</div>
<div class="float_one">LINUX</div>
<div class="float_one">HTML</div>
<div class="float_one">CSS
<div class="float_two">
<div>FLOAT</div>
<div>BACKGROUND</div>
<div>HOVER</div>
<div>DISPLAY</div>
</div>
</div>
</div>
</body>
</html>实现效果如下：
鼠标放到导航上，自动加载下拉次导航！
Correcting teacher：西门大官人Correction time：2019-02-17 10:14:30
Teacher's summary：作业写的很好，这种效果，还可以使用js来实现。不过CSS是最完美的